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EOS · Vulnerability

CVSS 3.1 8.2 HIGHCVSS 4.0 9.2 CRITICALCheck source for fixed versionsKEV status unknown

cve-program · CVE-2026-73458

Published

On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various routing protocols monitor status on BFD session(s).

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-73458

Published

EOS

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Arista Networks",
                    "product": "EOS",
                    "platforms": [
                        "710 Series",
                        "720D Series",
                        "720XP/722XPM Series",
                        "750X Series",
                        "7010TX Series",
                        "7020R/R4 Series",
                        "7130 Series running EOS",
                        "7170 Series",
                        "7050X3/X4 Series",
                        "7060X/X2/X4/X5/X6 Series",
                        "7260X/X3 Series",
                        "7280R/R2/R3/R4 Series",
                        "7300X/X3 Series",
                        "7320X Series",
                        "7358X4 Series",
                        "7368X4 Series",
                        "7388X5 Series",
                        "7500R/R2/R3 Series",
                        "7800R3/R4 Series",
                        "7700R4 Series",
                        "AWE 5000 Series",
                        "AWE 7200R Series",
                        "CloudEOS",
                        "cEOS-lab",
                        "vEOS-lab",
                        "CloudVision eXchange",
                        "virtual or physical appliance"
                    ],
                    "versions": [
                        {
                            "status": "affected",
                            "version": "4.36.0",
                            "lessThanOrEqual": "4.36.1F",
                            "changes": [
                                {
                                    "at": "4.36.2F",
                                    "status": "unaffected"
                                }
                            ],
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.35.0",
                            "lessThanOrEqual": "4.35.5M",
                            "changes": [
                                {
                                    "at": "4.35.6M",
                                    "status": "unaffected"
                                }
                            ],
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.34.0",
                            "lessThanOrEqual": "4.34.7M",
                            "changes": [
                                {
                                    "at": "4.34.8M",
                                    "status": "unaffected"
                                }
                            ],
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.33.0",
                            "lessThanOrEqual": "4.33.8M",
                            "changes": [
                                {
                                    "at": "4.33.9M",
                                    "status": "unaffected"
                                }
                            ],
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON

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